arch/ppc/platforms/4xx/xilinx_ml403.c

   1 /*
   2  * arch/ppc/platforms/4xx/xilinx_ml403.c
   3  *
   4  * Xilinx ML403 evaluation board initialization
   5  *
   6  * Author: Grant Likely <grant.likely@secretlab.ca>
   7  *
   8  * 2005 (c) Secret Lab Technologies Ltd.
   9  * 2002-2004 (c) MontaVista Software, Inc.
  10  *
  11  * This file is licensed under the terms of the GNU General Public License
  12  * version 2.  This program is licensed "as is" without any warranty of any
  13  * kind, whether express or implied.
  14  */
  15
  16 #include <linux/init.h>
  17 #include <linux/irq.h>
  18 #include <linux/tty.h>
  19 #include <linux/serial.h>
  20 #include <linux/serial_core.h>
  21 #include <linux/serial_8250.h>
  22 #include <linux/serialP.h>
  23 #include <asm/io.h>
  24 #include <asm/machdep.h>
  25 #include <asm/ppc_sys.h>
  26
  27 #include <syslib/gen550.h>
  28 #include <platforms/4xx/xparameters/xparameters.h>
  29
  30 /*
  31  * As an overview of how the following functions (platform_init,
  32  * ml403_map_io, ml403_setup_arch and ml403_init_IRQ) fit into the
  33  * kernel startup procedure, here's a call tree:
  34  *
  35  * start_here                                   arch/ppc/kernel/head_4xx.S
  36  *  early_init                                  arch/ppc/kernel/setup.c
  37  *  machine_init                                arch/ppc/kernel/setup.c
  38  *    platform_init                             this file
  39  *      ppc4xx_init                             arch/ppc/syslib/ppc4xx_setup.c
  40  *        parse_bootinfo
  41  *          find_bootinfo
  42  *        "setup some default ppc_md pointers"
  43  *  MMU_init                                    arch/ppc/mm/init.c
  44  *    *ppc_md.setup_io_mappings == ml403_map_io this file
  45  *      ppc4xx_map_io                           arch/ppc/syslib/ppc4xx_setup.c
  46  *  start_kernel                                init/main.c
  47  *    setup_arch                                arch/ppc/kernel/setup.c
  48  * #if defined(CONFIG_KGDB)
  49  *      *ppc_md.kgdb_map_scc() == gen550_kgdb_map_scc
  50  * #endif
  51  *      *ppc_md.setup_arch == ml403_setup_arch  this file
  52  *        ppc4xx_setup_arch                     arch/ppc/syslib/ppc4xx_setup.c
  53  *          ppc4xx_find_bridges                 arch/ppc/syslib/ppc405_pci.c
  54  *    init_IRQ                                  arch/ppc/kernel/irq.c
  55  *      *ppc_md.init_IRQ == ml403_init_IRQ      this file
  56  *        ppc4xx_init_IRQ                       arch/ppc/syslib/ppc4xx_setup.c
  57  *          ppc4xx_pic_init                     arch/ppc/syslib/xilinx_pic.c
  58  */
  59
  60 /* Board specifications structures */
  61 struct ppc_sys_spec *cur_ppc_sys_spec;
  62 struct ppc_sys_spec ppc_sys_specs[] = {
  63         {
  64                 /* Only one entry, always assume the same design */
  65                 .ppc_sys_name   = "Xilinx ML403 Reference Design",
  66                 .mask           = 0x00000000,
  67                 .value          = 0x00000000,
  68                 .num_devices    = 1,
  69                 .device_list    = (enum ppc_sys_devices[])
  70                 {
  71                         VIRTEX_UART,
  72                 },
  73         },
  74 };
  75
  76 #if defined(XPAR_POWER_0_POWERDOWN_BASEADDR)
  77
  78 static volatile unsigned *powerdown_base =
  79     (volatile unsigned *) XPAR_POWER_0_POWERDOWN_BASEADDR;
  80
  81 static void
  82 xilinx_power_off(void)
  83 {
  84         local_irq_disable();
  85         out_be32(powerdown_base, XPAR_POWER_0_POWERDOWN_VALUE);
  86         while (1) ;
  87 }
  88 #endif
  89
  90 void __init
  91 ml403_map_io(void)
  92 {
  93         ppc4xx_map_io();
  94
  95 #if defined(XPAR_POWER_0_POWERDOWN_BASEADDR)
  96         powerdown_base = ioremap((unsigned long) powerdown_base,
  97                                  XPAR_POWER_0_POWERDOWN_HIGHADDR -
  98                                  XPAR_POWER_0_POWERDOWN_BASEADDR + 1);
  99 #endif
 100 }
 101
 102 /* Early serial support functions */
 103 static void __init
 104 ml403_early_serial_init(int num, struct plat_serial8250_port *pdata)
 105 {
 106 #if defined(CONFIG_SERIAL_TEXT_DEBUG) || defined(CONFIG_KGDB)
 107         struct uart_port serial_req;
 108
 109         memset(&serial_req, 0, sizeof(serial_req));
 110         serial_req.mapbase      = pdata->mapbase;
 111         serial_req.membase      = pdata->membase;
 112         serial_req.irq          = pdata->irq;
 113         serial_req.uartclk      = pdata->uartclk;
 114         serial_req.regshift     = pdata->regshift;
 115         serial_req.iotype       = pdata->iotype;
 116         serial_req.flags        = pdata->flags;
 117         gen550_init(num, &serial_req);
 118 #endif
 119 }
 120
 121 void __init
 122 ml403_early_serial_map(void)
 123 {
 124 #ifdef CONFIG_SERIAL_8250
 125         struct plat_serial8250_port *pdata;
 126         int i = 0;
 127
 128         pdata = (struct plat_serial8250_port *) ppc_sys_get_pdata(VIRTEX_UART);
 129         while(pdata && pdata->flags)
 130         {
 131                 pdata->membase = ioremap(pdata->mapbase, 0x100);
 132                 ml403_early_serial_init(i, pdata);
 133                 pdata++;
 134                 i++;
 135         }
 136 #endif /* CONFIG_SERIAL_8250 */
 137 }
 138
 139 void __init
 140 ml403_setup_arch(void)
 141 {
 142         ml403_early_serial_map();
 143         ppc4xx_setup_arch();    /* calls ppc4xx_find_bridges() */
 144
 145         /* Identify the system */
 146         printk(KERN_INFO "Xilinx ML403 Reference System (Virtex-4 FX)\n");
 147 }
 148
 149 /* Called after board_setup_irq from ppc4xx_init_IRQ(). */
 150 void __init
 151 ml403_init_irq(void)
 152 {
 153         ppc4xx_init_IRQ();
 154 }
 155
 156 void __init
 157 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 158               unsigned long r6, unsigned long r7)
 159 {
 160         ppc4xx_init(r3, r4, r5, r6, r7);
 161
 162         identify_ppc_sys_by_id(mfspr(SPRN_PVR));
 163
 164         ppc_md.setup_arch = ml403_setup_arch;
 165         ppc_md.setup_io_mappings = ml403_map_io;
 166         ppc_md.init_IRQ = ml403_init_irq;
 167
 168 #if defined(XPAR_POWER_0_POWERDOWN_BASEADDR)
 169         ppc_md.power_off = xilinx_power_off;
 170 #endif
 171
 172 #ifdef CONFIG_KGDB
 173         ppc_md.early_serial_map = ml403_early_serial_map;
 174 #endif
 175 }
 176